JP2008023648A - Working tool - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an art effective for improving a fitting feeling of a hand grip in a working tool of a constitution disposed with at least two hand grips grasped by a worker in working at the front/rear of a tool and having a grip part where the hand grip in the tool front side is longitudinally extended in the left/right direction. <P>SOLUTION: A hedge trimmer 100 is so constituted that the front grip 130 in the tool front side has a projection part 131a where a first extension part 131 extending in the left/right direction projects obliquely backward and upward, and the projection part 131a is accorded with a recessed shape of a worker's palm in a grip grasping state. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a work tool construction technique.

Conventionally, for example, Patent Document 1 below discloses a trimming machine having a main handle and an auxiliary handle in a housing. In this trimming machine, an auxiliary handle is provided in front of the tool with respect to the main handle. When the tool is used, the main handle is held by one hand of the operator, and the auxiliary handle is held by the other hand of the operator. Further, the auxiliary handle disposed on the tool front side of the main handle and the auxiliary handle has a substantially C-shaped configuration, and has a grip portion extending in the longitudinal direction in the left-right direction.
JP 2003-235352 A

By the way, in various working tools in which an operator performs work by gripping a handgrip like the trimming machine described in Patent Document 1, the operator's hand is improved by improving the fit feeling of the hand. Technology that reduces fatigue is required. Therefore, the present inventor gives the hand fit (feeling of gripping, feeling of crispness, etc.) felt by the worker holding the handgrip when the handgrip is used. The influence was examined earnestly. As a result of the examination, the present inventor has obtained an optimum handgrip shape with respect to a handgrip having a grip portion extending longitudinally in the left-right direction on the front side of the tool, such as the auxiliary handle described in Patent Document 1 above. By pursuing it, it was possible to improve the fit of the fingers of the workers, and succeeded in finding a hand grip structure in which the hands of the workers are hard to get tired even during long hours of work.
In the present invention, in the work tool having a configuration in which at least two hand grips gripped by an operator during work are provided on the front and rear sides of the tool, and the hand grip on the front side of the tool has a grip portion extending in the longitudinal direction in the left-right direction It is an object of the present invention to provide an effective technique for improving the hand grip fit.

  In order to achieve the above object, the invention described in each claim is configured.

The work tool according to the present invention includes at least a main body, a tip tool, a drive mechanism, a first hand grip, and a second hand grip.
The tip tool of the present invention is configured as a tool attached to the tool tip of the main body, and is used for various operations such as cutting, cutting, cutting, and polishing.
The drive mechanism of this invention is comprised as a mechanism accommodated in a main-body part and driving a front-end tool. As a drive mechanism of the present invention, an electric motor that operates with a current supplied from a battery mounted on a tool body or a current supplied from a power source using a power cord, or a drive mechanism that operates with the pressure of air or combustion gas Can be adopted. Accordingly, the “work tool” of the present invention includes a wide range of electric work tools, air-driven and gas-driven work tools.
The 1st handgrip of this invention is provided in the tool back side of a main-body part, and is comprised as a handgrip hold | gripped with one hand of an operator at the time of tool use.
The second hand grip of the present invention is provided on the front side of the tool relative to the first hand grip in the main body, and is configured as a hand grip that is gripped by the operator's other hand when using the tool. In the present invention, in particular, the second hand grip is provided with a round shaft-shaped grip portion extending in the longitudinal direction in the left-right direction of the main body portion, and the grip portion has a convex portion protruding obliquely upward rearward. It is said. Note that this gripping portion corresponds to a portion to which the gripping force (grip strength) of the hand reaches when the operator grips the handgrip. In addition, the “round shaft shape” referred to in the present specification widely includes a hollow cylindrical shape and a solid cylindrical shape whose outer periphery is a perfect circle or an ellipse. In the present invention, it is sufficient that the grip portion of the second hand grip has a component extending longitudinally in the left-right direction of the main body portion.

  By the way, in the work tool having a configuration in which the first hand grip and the second hand grip held by the worker at the time of work are arranged at the front and rear of the tool as in the work tool of the present invention, Since the operator is positioned between the first hand grip and the second hand grip, one hand of the operator extends from the rear side of the tool and acts on the second hand grip on the front side of the tool. A two-hand grip will be gripped. In addition, a concave shape (also referred to as a “dent”) is formed on the palm of the operator gripping the second hand grip. Therefore, in the present invention, taking into consideration that this concave shape is formed in the palm in the grip holding state, among the second hand grips, a round shaft-shaped grip extending in the longitudinal direction in the left-right direction of the main body portion. The part employ | adopts the structure provided with the convex part which protrudes toward back diagonally upward. The convex portion having such a configuration is a convex portion facing an operator positioned on the rear side of the tool relative to the grip portion in the grip holding state of the second hand grip. In relation to the position of the operator's hand, When the operator's hand extending from diagonally upward to obliquely downward in the front grips the grip portion of the second hand grip from obliquely upward in the rear, the convex portion acts on the palm of the worker. According to such a configuration, the convex portion of the grip portion having a round shaft shape in the second hand grip matches the concave shape portion of the palm of the worker in the grip grip state. It is possible to enhance the fit. Therefore, a handgrip structure is realized in which the operator's hands are not fatigued even during long-time work.

  In a further form of the work tool according to the present invention, the second hand grip relates to the palm of the worker holding the grip portion, and an extended line extending along the first finger joint and an emotion line or an intelligent line (" Convex portions are formed in conformity with the concave portions of the palm partitioned by extending lines extending along the “brain lines”. With regard to this configuration, among the palms of workers in gripping state, in particular, extending along the extended line extending along the first finger joint and the emotional line or intelligence line (also referred to as “brain line”). The region partitioned by the extending line is a portion where a concave shape is particularly easily formed. Therefore, according to such a configuration, the convex portion of the grip portion having a round shaft shape in the second hand grip more reliably matches the concave portion of the palm of the worker in the grip grip state. A hand grip structure with a higher fit is realized in consideration of the palm shape of the worker in gripping state.

  In a further form of the work tool according to the present invention, the second hand grip has a configuration in which a round shaft-shaped gripping portion protrudes in a curved shape at R150 to R250 [mm] toward the operator side, and a convex portion is formed. Is done. The gripping portion having such a shape has a shape that follows the concave shape of the palm of the worker in the grip gripping state, and as a result based on the evaluation by the subject performed by the inventor in particular, it has been confirmed that the fit is high. It was. Therefore, according to such a configuration, it is possible to further improve the fit of the grip portion of the second hand grip.

In the work tool of a further form according to the present invention, the second hand grip is connected to the grip part from both ends of the round shaft-shaped grip part protruding in a curved shape toward the operator, and then extends downward. A second holding part having a round shaft shape attached to the part, and the second holding part protrudes in a curved shape toward the front of the tool. In this second hand grip, the round shaft-shaped gripping portion protrudes in a curved shape toward the operator, and both ends of the gripping portion once extend to the tool front side. Therefore, as in the present invention, by adopting a configuration in which the second gripping portion extending downward from both ends of the gripping portion to the main body portion protrudes in a curved shape toward the front of the tool, The shape of the second hand grip that reaches the main body through the second gripping portion can be a continuous smooth (natural) curve. Therefore, according to such a configuration, it is possible to suppress a sense of incongruity when an operator changes a part to be gripped among the parts of the second hand grip during work.
In the present invention, it is sufficient for the second grip portion of the second hand grip to have a component that is connected to the grip portion from both ends of the grip portion and extends downward, and from both ends of the grip portion. A configuration that extends vertically downward, a configuration that extends rearward and obliquely downward from both ends of the gripping portion, and a configuration that extends diagonally forward and downward from both ends of the gripping portion can be appropriately employed.

  In a further form of the work tool according to the present invention, at least one of the grip portion of the second hand grip and the second grip portion is configured such that the cross-sectional diameter of the grip portion is uniform in the extending direction. By the way, in a work that is assumed to set the blade as the tip tool at various angles, such as a hedge clipper work in a hedge trimmer, for example, the gripping position of the second hand grip is changed during the work according to the work request. May be replaced. Therefore, by making the cross-sectional diameter of at least one of the grip portion of the second hand grip and the second grip portion uniform as in the present invention, the operator feels uncomfortable even if the grip position changes during the work. Therefore, a grip shape that is less likely to get tired is realized.

  In a further form of the work tool according to the present invention, the gripping section has a cross-sectional diameter of φ25 to 35 [mm]. It was confirmed that the gripping part having such a shape has a high fit feeling as a result of the evaluation by the subject performed by the inventor. The reason for this is that a thin grip with a smaller cross-sectional diameter than the set range tends to feel heavy, and there is a tendency for fingers to remain when gripped, and a thicker grip with a larger cross-sectional diameter than the set range has a greater appearance. There is a tendency to feel a sense of weight. Therefore, according to such a configuration, it is possible to further improve the fit feeling regarding the grip portion of the second hand grip and the second grip portion.

  In the work tool according to a further aspect of the present invention, the second hand grip has a curved portion of R45 to R50 [mm] at the connecting portion between the grip portion and the second grip portion. The second hand grip having such a shape has a high fit with respect to the second gripping portion and the connecting portion between the gripping portion and the second gripping portion. The reason for this is that if the R is smaller than the set range, the connecting portion tends to bend and the connected portion tends to be difficult to grip, and if the R is larger than the set range, the connected portion becomes easy to grip. This time, the region extending in a straight line in the second gripping portion tends to be narrowed and it becomes difficult to grip the second gripping portion. Therefore, according to such a configuration, it is possible to improve the fit feeling related to the second gripping portion of the second handgrip and the connecting portion between the gripping portion and the second gripping portion.

  As described above, according to the present invention, at least two handgrips held by an operator during work are arranged at the front and rear of the tool, and the handgrip on the front side of the tool extends in the longitudinal direction in the left-right direction. In the work tool having the configuration, it is possible to improve the fit of the handgrip, particularly by devising the shape of the handgrip on the front side of the tool.

  Hereinafter, an embodiment of a “work tool” of the present invention will be described with reference to the drawings. In the present embodiment, as an example of a work tool, a hedge trimmer used for horticultural work such as hedge cutting, planting pruning, or pruning roadside trees will be described. This hedge trimmer is also referred to as “work tool” or “garden tool”.

The appearance of a hedge trimmer 100 according to an embodiment of the present invention is shown in FIGS. FIG. 1 shows a side view of a hedge trimmer 100 according to an embodiment of the present invention, and FIG. 2 shows a plan view of the hedge trimmer 100 in FIG.
As shown in FIGS. 1 and 2, the hedge trimmer 100 according to the present embodiment is mainly composed of a trimmer body 110, a main grip 120, a front grip 130, a blade assembly 140, and a drive mechanism 150.

  The trimmer main body 110 is configured to house various electrical parts and mechanical parts related to driving of the blade assembly 140 in the housing 112. The trimmer body 110 constitutes the “body” in the present invention. The trimmer main body 110 and the main grip 120 or the front grip 130 may be collectively referred to as a “main body”.

  The main grip 120 is configured as a handle (also referred to as “main handle” or “rear handle”) provided on the tool rear side (left side in FIG. 1) of the housing 112 of the trimmer body 110. The main grip 120 is typically gripped by a worker's dominant hand. The main grip 120 corresponds to the “first hand grip held by one hand of the operator when using the tool” in the present invention.

  The front grip 130 is an annular or substantially C-shaped handle (“auxiliary handle” or “front” attached to the attachment portions 114, 114 provided on the front side (right side in FIG. 1) of the housing 112 of the trimmer body 110. Part handle). The front grip 130 as a whole extends obliquely forward and upward from the attachment portions 114 and 114 in a side view. The front grip 130 is typically gripped by a hand opposite to the operator's dominant hand. The front grip 130 corresponds to “a second hand grip held by the operator's other hand when using the tool” in the present invention.

  Regarding the arrangement of the grip portion of the main grip 120 and the grip portion of the front grip 130, an operator is positioned between the main grip 120 and the front grip 130 in the longitudinal direction of the tool, and the grip portion of the main grip 120 and the front grip 130 It is preferable to design the center of gravity of the hedge trimmer 100 at an intermediate position of the gripping portion of the grip 130. As a result, when the worker supports the hedge trimmer 100, the load applied to the dominant hand and the opposite hand can be substantially equalized, and the burden on the operator's hand can be reduced.

  The blade assembly 140 includes a tip tool extending longitudinally from the front side (right side in FIG. 1) of the housing 112 of the trimmer main body 110 to the front, and specifically, two pieces that overlap each other as the tip tool. Comb blades (cutting blades) 141 and 142 are used. A drive mechanism (such as an electric motor) 150 for driving the blade assembly 140 is accommodated in the housing 112 of the trimmer main body 110. The drive mechanism 150 is operated by pulling a trigger 122 provided on the main grip 120, and the blades 141 and 142 of the blade assembly 140 driven in this operation state are used for trimming hedges, road trees and the like. The pruning work is performed by acting. In addition, since the operation principle itself of the hedge trimmer 100 belongs to a well-known technical matter, a detailed description of its configuration and operation is omitted for convenience. The blades 141 and 142 of the blade assembly 140 here are tip tools arranged at the tool tip of the trimmer main body 110, and constitute the “tip tool” in the present invention. The drive mechanism 150 that drives the blade assembly 140 corresponds to the “drive mechanism” in the present invention.

  Next, further specific configuration and operation of the front grip 130 will be described in detail with reference to FIGS.

  FIG. 3 shows a view of the front grip 130 of the present embodiment as viewed from the direction of arrow A in FIG. 1, and FIG. 4 shows an arrow view of the front grip 130 in FIG. As shown in FIGS. 3 and 4, the front grip 130 of the present embodiment is configured to include a first extending portion 131 and second extending portions 133 and 133. The first extending portion 131 is configured as a portion extending in the longitudinal direction in the left-right direction above the trimmer main body portion 110. On the other hand, the second extending portions 133 and 133 are connected to the first extending portion 131 from the end portions 132 and 132 of the first extending portion 131 on the side of the trimmer main body portion 110 and extend downward. It is comprised as a site | part attached to the attaching parts 114 and 114 by the trimmer main-body part 110 side. The first extending portion 131 referred to here corresponds to the “gripping portion” in the present invention, and the second extending portions 133 and 133 referred to here correspond to the “second gripping portion” in the present invention.

  As shown in FIGS. 3 and 4, in the present embodiment, the entire front grip 130, that is, the first extending portion 131 and the second extending portions 133, 133 both have a sectional diameter (the sectional diameter in FIG. 4). d) is a uniform round shaft shape. The round shaft shape here widely includes a hollow cylindrical shape whose outer periphery is a perfect circle or an ellipse and a solid columnar shape. By the way, when it is assumed that the blade, which is the tip tool, is set at various angles, such as a hedge clipper operation in a hedge trimmer, the gripping position of the front grip 130 changes during the operation depending on the work request. There is. Therefore, by uniformly configuring the cross-sectional diameter of the entire front grip 130 as in the present embodiment, it is possible to prevent the operator from feeling uncomfortable even if the gripping position is changed during the operation. A grip shape that prevents fatigue is achieved.

  Further, in the front grip 130 of the present embodiment, the end portions 132 and 132 that are the connecting portions of the first extending portion 131 and the second extending portions 133 and 133 are curved in a range of R45 to R50 [mm]. ing. The end portions 132 and 132 referred to here correspond to “the connecting portion between the gripping portion and the second gripping portion” in the present invention. Such a shape has a high fit with respect to the second extending portions 133 and 133 and the end portions 132 and 132. The reason for this is that if R is made smaller than the set range, the end portions 132 and 132 tend to bend tightly and the end portions 132 and 132 tend to be difficult to grip. 132 and 132 can be easily gripped, but the region extending linearly among the second extending portions 133 and 133 may be narrowed and the second extending portions 133 and 133 may tend to be difficult to grip. Can be mentioned.

  As shown in FIG. 3, as a further feature of the configuration of the first extension portion 131, the first extension portion 131 includes a convex portion (“R portion” protruding toward the rear of the tool (left side in the drawing). 131a) 131a. The convex portion 131a has a configuration in which a round shaft-shaped first extending portion 131 having a uniform cross-sectional diameter protrudes in a curved shape toward the rear of the tool, that is, a convex portion of each portion of the first extending portion 131. The surface opposite to the portion 131a is formed with a recess corresponding to the convex portion 131a, and the bending is, for example, R150 to R250 [mm].

  On the other hand, as shown in FIG. 4, as a structural feature of the second extending portions 133, 133, the round shaft-shaped second extending portions 133 located on both sides of the first extending portion 131 are arranged in front of the tool. It is the structure which protruded in the curved shape toward the (right side in a figure). For the actual attachment state in which the front grip 130 is attached to the trimmer main body 110, the state shown in FIG. 5 is referred to.

  Here, FIG. 5 is a side view of the front grip 130 of the present embodiment, and shows the orientation of the front grip 130 when the blade assembly 140 is in a horizontal state. As shown in FIG. 5, in the actual attachment state in which the front grip 130 is attached to the trimmer main body 110, the convex portion 131a of the first extending portion 131 of the front grip 130 places the blade assembly 140 in a horizontal state. In this case, it is configured to project rearward and obliquely upward (D direction in FIG. 5) with respect to the horizontal line (C direction in FIG. 5). The direction D in FIG. 5 coincides with a direction toward an operator holding the main grip 120 with one hand and holding the front grip 130 with the other hand. In this case, the angle θ formed by the C direction and the D direction can be appropriately set based on the specification of the tool, the shape of the hand grip, and the like, and the angle θ can be set to 30 °, for example. For example, the protruding direction of the convex portion 131a of the first extending portion 131 can be appropriately changed in relation to the concave shape (dent region) of the palm of the operator when gripping the first extending portion 131.

  With regard to this configuration, one hand of the operator extends from the rear side of the tool and acts on the front grip 130 on the front side of the tool, and grips the first extending portion 131 of the front grip 130. In consideration of the formation of a concave shape (also referred to as a “dent”) on the palm of the gripped worker, the first extending portion 131 is provided with a convex portion 131a that is inclined rearward and upward. is doing. That is, the convex portion 131a having such a configuration is a convex portion that faces the worker located on the rear side of the tool relative to the first extending portion 131 when the front grip 130 is gripped. In this relation, when the operator's hand extending from the rear diagonally upward to the front diagonally downward grips the first extending portion 131 of the front grip 130 from the rear diagonally upward, it is placed on the palm of the worker. The convex part 131a will act. According to such a configuration, the convex portion 131a provided on the first extending portion 131 of the front grip 130 is a concave portion of the palm of the worker holding the grip, particularly an R portion contact region 200 described later. Will be met. The convex portion 131a here corresponds to the “convex portion protruding obliquely upward rearward” in the present invention.

  On the other hand, as shown in FIG. 5, each second extending portion 133 of the front grip 130 is inclined obliquely downward and rearward from each end portion 132 of the first extending portion 131 when the blade assembly 140 is in a horizontal state. It is configured to extend and project in a curved shape toward the front diagonally downward. In the front grip 130, the first extending portion 131 having a round shaft shape protrudes in a curved shape toward the worker side, and the end portions 132, 132 of the first extending portion 131 are temporarily moved to the front side of the tool. It will be extended. Therefore, as in the present embodiment, the second extending portions 133 and 133 extending from the end portions 132 and 132 of the first extending portion 131 to the mounting portions 114 and 114 on the trimmer body 110 side are provided. By adopting a configuration projecting in a curved shape toward the front of the tool, a front grip that extends from the first extending portion 131 to the trimmer main body 110 side through the end portions 132 and 132 and the second extending portions 133 and 133 The shape of 130 can be a continuous smooth (natural) curve. Therefore, according to such a configuration, it is possible to suppress a sense of incongruity when an operator changes a part to be gripped among the parts of the front grip 130 during work.

  Here, FIG. 6 shows a state in which the front grip 130 of the present embodiment shown in FIGS. 3 to 5 is gripped by the left hand of the worker, and the left hand of the worker gripping the front grip 130 of the present embodiment. FIG. 7 shows the relationship between the protrusions 131a of the front grip 130 and the protrusions 131a. 6 and 7 describe the case where the front grip 130 is gripped by the operator's left hand, the front grip 130 may be gripped by the right hand depending on the operator's dominant hand.

  As shown in FIG. 6, when the front grip 130 is gripped by the left hand of the operator, the R portion contact area 200 indicated by the broken line in FIG. It will contact 131a. The R portion contact area 200 is an area extending in a direction (left and right direction in FIG. 7) intersecting the extending direction of the finger among the parts of the palm of the worker, It becomes a concave shape at the palm. Specifically, as shown in FIG. 7, along the first finger joint (interphalangeal joint) across the middle finger joint joint part (also referred to as “tactile ball part”) in the palm of the operator. A region defined by an extended line extending in FIG. 7 (extended line L1 in FIG. 7) and an extended line extending along the emotional line or intelligence line (extended line L2 in FIG. 7) It is defined as the contact area 200. The R-part contact region 200 has a concave shape (a concave region) in the grip gripping state, but the convex portion 131a of the front grip 130 of the present embodiment has a concave shape (a concave curve) of the R-part contact region 200. ), And this convex portion 131a matches the concave portion of the R portion abutting region 200. Therefore, it is possible to enhance the fit of the operator's hand, and a hand grip structure is realized in which the operator's hand does not get tired even during long-time work.

(Evaluation of grip section diameter of front grip 130)
When evaluating the grip cross-sectional diameter of the front grip 130, three types of grip structures having cross-sectional diameters of φ25 [mm], φ30 [mm], and φ35 [mm] were prepared. In addition, each grip structure was evaluated by the subject assuming top and side trimming with the hedge trimmer 100. The subjects in this evaluation were 12 Japanese men in their 20s and 40s with an average height of 173 cm. As a result of this evaluation, it was found that a grip having a cross-sectional diameter of φ25 to 35 [mm] was preferred by the subject, and in particular, a grip having a grip cross-sectional diameter of φ30 [mm] was most preferred by the subject. The reason for this is that with regard to the grip cross-sectional diameter, a thin grip with a small cross-sectional diameter tends to feel heavy, and there is a tendency for fingers to remain when gripped, and a thick grip with a large cross-sectional diameter has a heavy weight on appearance. There is a tendency to feel easily. A grip with a cross-sectional diameter of φ30 [mm] is larger than a grip with a cross-sectional diameter of φ25 [mm], so it is effective in reducing the actual weight and improving the fit. ], It is difficult to feel the weight of the appearance because it is smaller than the grip.

(Evaluation of the degree of curvature of the convex portion 131a of the front grip 130)
When evaluating the degree of curvature of the convex portion 131a of the front grip 130, three types of grip structures having a cross-sectional diameter of φ30 [mm] and bends of R100 [mm], R150 [mm], and R250 [mm] were prepared. . In addition, each grip structure was evaluated by the subject assuming top and side trimming with the hedge trimmer 100. The subjects in this evaluation were 13 Japanese men in their 20s to 40s with an average height of 172 cm. As a result of this evaluation, it was found that grips with bending of R150 [mm] and R250 [mm] were preferred by the subject, and in particular, grips with bending of R250 [mm] were most preferred by the subject. The reason for this is that a grip with a bend of R250 [mm] has a better fit (grip feeling, sickness, etc.), and the concave shape (dent) of the R portion contact area 200 of the operator's hand as described above. Curve). Based on this result, the degree of curvature of the convex portion 131a of the front grip 130 is preferably set to R150 to R250 [mm], and particularly preferably R250 [mm].

  In addition, regarding the concave shape of the R portion contact region 200 of the operator's hand, when the shape of the subject's palm assuming the grip gripping state was actually measured, the concave shape of the subject's palm was R100 to R500 [mm]. It was confirmed that it was within the range. Specifically, the concave shape of the palm of the subject was measured as R100 to R500 [mm] as a result of measuring the concave shape of the palm by applying an R ruler to the palm of the subject imitating the gripping state. Further, as a result of measuring the shape of the clay formed by gripping the clay as if the test subject was gripping, the subject's palm dent shape was R250 to R400 [mm]. R100 to R500 [mm], which is the range of the concave shape of the subject's palm obtained from these results, includes R150 to R250 [mm], which is a preferable range of the degree of curvature of the convex portion 131a of the front grip 130. It was confirmed that.

  As described above, according to the hedge trimmer 100 of the present embodiment, the fit of the front grip 130 can be improved particularly by devising the shape of the front grip 130 on the front side of the tool.

  Specifically, according to the present embodiment, the convex portion 131a of the first extending portion 131 of the front grip 130 surely matches the R portion contact area 200 of the palm of the worker holding the grip. Therefore, a hand grip structure with a high fit is realized in consideration of the palm shape of the worker in grip holding state. In particular, when the degree of curvature is set to R150 to R250 [mm], the R portion contact area 200 of the worker's palm is surely fitted.

  Further, in the present embodiment, each of the second extending portions 133 of the front grip 130 is configured to protrude in a curved shape toward the front obliquely lower side, so that the first extending portion 131 and the trimmer body 110 side. The shape of the front grip 130 that reaches the top can be a continuous, smooth (natural) curve, and the operator feels uncomfortable when changing the gripping portion of the front grip 130 during work. Can be suppressed.

  Further, in the present embodiment, by uniformly configuring the cross-sectional diameter of the entire front grip 130, it is possible to prevent the operator from feeling uncomfortable even if the gripping position is changed during the work, and thus fatigue. A difficult grip shape is realized. In particular, by setting the cross-sectional diameter to φ25 to 35 [mm], a grip structure that reduces the actual weight feeling and hardly feels the weight feeling on the appearance is realized.

  Moreover, in this Embodiment, the edge parts 132 and 132 which are the connection parts of the 1st extension part 131 and the 2nd extension parts 133 and 133 in the front grip 130 are made into the curved shape of R45-R50 [mm]. As a result, it is possible to improve the fit of the second extending portions 133 and 133 and the end portions 132 and 132 of the front grip 130.

(Other embodiments)
Note that the present invention is not limited to the above embodiment, and various application examples and modification examples based on the present embodiment can be conceived. For example, the following embodiments to which this embodiment is applied can be implemented.

  In the present embodiment described above, the case where the front grip 130 is configured as an annular or substantially C-shaped handle has been described. However, in the present invention, the hand grip on the front side of the tool extends at least in the left-right direction. That is, what is necessary is just to have the holding part equivalent to the 1st extension part 131, and the front grip 130 can be suitably changed into shapes, such as a substantially L shape and a substantially T shape, as needed.

  In the above-described embodiment, the case where the first extending portion 131 of the front grip 130 extends in the left-right direction above the trimmer main body 110 has been described. However, in the present invention, the first extending portion is described. The present invention can also be applied to a configuration of a gripping part that extends in the left-right direction on the side of the main body corresponding to the 131 trimmer main body 110.

  Moreover, in this Embodiment mentioned above, although the front grip 130 which has the 1st extension part 131 and the 2nd extension part 133, 133 was described, in this invention, the holding part corresponded to the 1st extension part 131. The present invention can also be applied to a configuration of a handgrip having only

  Further, in the present embodiment described above, the first extension 131 has a round shaft shape with a uniform cross-sectional diameter, and the first extension 131 protrudes in a curved shape toward the rear of the tool. However, in the present invention, a portion corresponding to the convex portion 131a can be configured by a shape other than the curved shape. For example, a configuration is adopted in which the cross-sectional diameter of only the portion corresponding to the convex portion 131a among the portions of the first extending portion 131 is increased, and a linear shape is formed in which no depression is formed on the surface opposite to the convex portion 131a. be able to.

  In the above-described embodiment, the case where the present invention is applied to the work tool having the two hand grips of the main grip 120 and the front grip 130 has been described. However, in the present invention, the work having a plurality of hand grips is performed. In the tool, the present invention can be applied to the configuration of the hand grip on the front side of the tool among the plurality of hand grips.

  Further, in the present embodiment described above, a hedge trimmer used for horticultural work is described as an example of a work tool. However, the present invention is not limited to a hedge trimmer, and an operator grips at the time of work. This is applicable to various types of work tools having a configuration in which at least two hand grips are disposed on the front and rear sides of the tool, and the hand grip on the front side of the tool has a grip portion extending in the longitudinal direction in the left-right direction. At this time, as for the driving method of the tip tool, a configuration in which the tip tool is driven by a rechargeable or drive motor driven by an AC power source, a configuration in which the tip tool is driven by the pressure of air or gas, etc. are appropriately adopted. Can do.

It is a side view of the hedge trimmer 100 of one embodiment of this invention. It is a top view of the hedge trimmer 100 in FIG. It is the figure which looked at the front grip 130 of this Embodiment from the arrow A direction in FIG. FIG. 4 is an arrow view regarding BB of the front grip 130 in FIG. 3. FIG. 4 is a side view of the front grip 130 of the present embodiment, and is a view showing the orientation of the front grip 130 when the blade assembly 140 is in a horizontal state. It is a figure which shows a mode that the front grip 130 of this Embodiment was hold | gripped with the operator's left hand. It is a figure which shows the relationship between the operator's left hand holding the front grip of this Embodiment, and the convex part 131a of the front grip.

Explanation of symbols

100 Hedge trimmer (work tool)
110 Trimmer body portion 112 Housing 114 Mounting portion 120 Main grip 122 Trigger 130 Front grip 131 First extending portion 131a Convex portion (R portion)
132 End 133 Second Extension 140 Blade Assembly 141, 142 Blade 150 Drive Mechanism 200 R Part Contact Area

Claims (7)

The main body,
A tip tool disposed at the tool tip of the main body,
A drive mechanism housed in the main body and driving the tip tool;
A first hand grip that is provided on the tool rear side of the main body and is gripped by one hand of an operator when using the tool;
A second hand grip that is provided on the front side of the tool relative to the first hand grip in the main body and is gripped by the other hand of the operator when using the tool;
With
The second hand grip includes a round shaft-shaped gripping portion extending in a longitudinal direction with respect to the left-right direction of the main body, and the gripping portion has a convex portion protruding obliquely upward rearward. A work tool characterized by The work tool according to claim 1,
The second hand grip is divided by an extended line extending along the first finger joint and an extended line extending along the emotional line or the intelligent line with respect to the palm of the operator holding the grip part. A working tool characterized in that the convex portion is formed in accordance with the concave portion of the palm. The work tool according to claim 1 or 2,
The work tool is characterized in that the second hand grip has a configuration in which the convex portion is formed by the round shaft-shaped gripping portion protruding in a curved shape at R150 to R250 [mm] toward the operator side. The work tool according to claim 3,
The second hand grip has a round shaft-shaped first attached to the main body portion after being connected to the grip portion from both ends of the round shaft-shaped grip portion protruding in a curved shape toward the operator side. A work tool having two gripping portions, wherein the second gripping portion protrudes in a curved shape toward the front of the tool. The work tool according to claim 3 or 4,
At least one of the grip portion of the second hand grip and the second grip portion is configured such that the cross-sectional diameter of the grip portion is configured uniformly in the extending direction. The work tool according to claim 5,
A work tool having a configuration in which a cross-sectional diameter of the grip portion is φ25 to 35 [mm]. The work tool according to any one of claims 4 to 6,
The second hand grip has a configuration in which a connecting portion between the grip portion and the second grip portion has a curved shape of R45 to R50 [mm].

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